Last change
on this file since 445 was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
877 bytes
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Line | |
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1 | #include <stdlib.h>
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2 | #include <limits.h>
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3 | #include <sys/stat.h>
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4 | #include <fcntl.h>
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5 | #include <errno.h>
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6 | #include <unistd.h>
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7 | #include <string.h>
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8 | #include "syscall.h"
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9 |
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10 | void __procfdname(char *, unsigned);
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11 |
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12 | char *realpath(const char *restrict filename, char *restrict resolved)
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13 | {
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14 | int fd;
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15 | ssize_t r;
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16 | struct stat st1, st2;
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17 | char buf[15+3*sizeof(int)];
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18 | char tmp[PATH_MAX];
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19 |
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20 | if (!filename) {
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21 | errno = EINVAL;
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22 | return 0;
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23 | }
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24 |
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25 | fd = sys_open(filename, O_PATH|O_NONBLOCK|O_CLOEXEC);
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26 | if (fd < 0) return 0;
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27 | __procfdname(buf, fd);
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28 |
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29 | r = readlink(buf, tmp, sizeof tmp - 1);
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30 | if (r < 0) goto err;
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31 | tmp[r] = 0;
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32 |
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33 | fstat(fd, &st1);
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34 | r = stat(tmp, &st2);
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35 | if (r<0 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) {
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36 | if (!r) errno = ELOOP;
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37 | goto err;
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38 | }
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39 |
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40 | __syscall(SYS_close, fd);
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41 | return resolved ? strcpy(resolved, tmp) : strdup(tmp);
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42 | err:
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43 | __syscall(SYS_close, fd);
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44 | return 0;
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45 | }
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